FLOOR, MROUND, CEILING, ISO CEILING – DAX Guide

FLOOR: Rounds a number down, toward zero, to the nearest multiple of significance.
https://dax.guide/floor/

MROUND: Returns a number rounded to the desired multiple.
https://dax.guide/mround/

CEILING: Rounds a number up, to the nearest integer or to the nearest unit of significance.
https://dax.guide/ceiling/

ISO.CEILING: Rounds a number up, to the nearest integer or to the nearest multiple of significance.
https://dax.guide/iso-ceiling/